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[CLD-1070] AC3 Mod
https://forum.lddb.com/viewtopic.php?f=53&t=10326		 Page 1 of 1
Author:  ldstl [ 07 Apr 2022, 16:48 ]
Post subject:  [CLD-1070] AC3 Mod  Topic is solved
Hey all, I'm trying to figure out the RF tap point for a CLD-1070 to install an AC-3 board. Full disclosure, I'm selling these boards for $35. I do not plan on hoarding this information once I find it. I'm trying to gather a database of sorts with images of the RF tap point on various players (+5V, -5V and GND, too).

I've attached some images here to show what I found via the Service Manual for a 1070.

Image
Page 27 of the Service Manual

Image
Page 39 of the Service Manual

Image
Image of the board I'm using

Thanks!
Author:  jefflang [ 10 Apr 2022, 01:02 ]
Post subject:  Re: AC3 Mod - CLD-1070
Hey Patrick!

I'm curious if someone can use an oscilloscope to confirm rf tap points?
Author:  ldfan [ 10 Apr 2022, 03:07 ]
Post subject:  Re: AC3 Mod - CLD-1070
The middle leg of Q351 is where I tapped my RF point on my CLD-M90 and it works great.

I don’t think there is really an exactly correct place to tap the RF so it can possibly work where you have it (only way to find out is to try it). In any case, the RF tap is somewhere just before the band pass filter of the CX chip which is exactly where you have it.

As for using an oscilloscope to find a tap point, I don’t think it’s necessary. So long as you know the general location you need to go, just see what happens. Worst case it doesn’t work and you just move on to another nearby point and try again.
Author:  cplusplus [ 10 Apr 2022, 19:23 ]
Post subject:  Re: AC3 Mod - CLD-1070
ldfan wrote:
In any case, the RF tap is somewhere just before the band pass filter

Yep - in Pioneer-land, you are looking for the two transistors just before the BPF. Some models even keep the same numbering: Q352.

No need to scope it, but if you really want to: http://www.laaudiofile.com/ac3mod.html
Author:  ldstl [ 11 Apr 2022, 05:17 ]
Post subject:  Re: AC3 Mod - CLD-1070
Thanks ldfan! I would've just PM'd you, but I wanted to put it out here. I want to get through and document as many players as I can. Will wait to get my hands on one of these in the near future.
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